Foundations

Orbitals.

Where electrons are, what shapes they fill, and in what order.

Video lesson · 16 min

Atomic Orbitals and Electron Configuration (s and p, Hund's Rule)

Posted 22 Oct 2026 on our YouTube channel. The player loads from YouTube only when you press play.

Chapters 13
  1. 0:00 Start here
  2. 1:18 What an orbital is
  3. 2:34 Two electrons per orbital
  4. 3:41 s and p orbital shapes
  5. 5:38 Why 2 and 8
  6. 6:40 Phase: the two colors
  7. 7:51 Filling order and configurations
  8. 9:55 The 4s and 3d trap
  9. 11:08 Hund's rule, box by box
  10. 13:24 Reading the periodic table
  11. 13:57 Recap
  12. 14:37 Practice problems
  13. 15:53 Next: hybridization
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